<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<!-- 1. 外链式 -->
		<link rel="stylesheet" type="text/css" href="css/my.css"/>
		<!-- 2. 导入式 -->
		<style type="text/css">
			@import url("css/your.css");
		</style>
		<!-- 3.内部式 -->
		<style type="text/css">
			div{
				font-size: 32px;
				color: yellow;
			}
		</style>
		
		
	</head>
	<body>
		<div>1111
			<span>2222</span>
		</div>
		
		<div>3333</div>
		<!-- 4. 行内式 -->
		<span style="text-decoration: underline;">4444</span>
	</body>
</html>
